| The millimeter wave antenna has the characteristics of short working wavelength,high positioning accuracy and strong penetrating power,and can be used for system miniaturization,light weight and high resolution design.These design advantages make millimeter-wave antennas play an important role in military fields such as radio interference,satellite communications,millimeter-wave radar design,and in remote sensing technology,civil communications,and radio astronomy.Among them,the design of rmillimeter-wave wideband phased array antenna is a hot topic in current research.In this paper,the research on the design of millimeter-wave wideband phased array antenna is carried out.Two millimeter-wave Vivaldi broadband antennas are designed.The relevant parameters of the antenna unit are studied,and the performance of the antenna after the design unit array is verified.This paper mainly does the following work.The related theory of Vivaldi antenna is studied,which proves that Vivaldi is a non-frequency-varying antenna and analyzes the current distribution on the slot line.On this basis,the antenna structure and radiation characteristics are discussed,and some aspects of structural design are discussed.In addition,the progress and implementation methods of the current Vivaldi antenna array method are also described.According to the high frequency characteristics of the millimeter wave,the feeding form and radiation structure of the Vivaldi antenna are improved,and a wide-angle scanning antenna working in the Ka band is obtained.The use of an all-metal radiating element makes it easier to integrate circuits and systems with a higher degree of design freedom.The coupled feed mode helps to easily adjust the incident impedance of the feeder terminal,and is also beneficial to extend the impedance bandwidth of the antenna.The feed network and the radiating antenna structure are relatively independent and easy to assemble.The effects of each structural parameter are then analyzed and the optimal size is selected.According to the simulation results,the optimized Vivaldi antenna has good broadband and wide-angle scanning performance.Considering the truncation effect,the finite array is designed to compare the antenna performance.Based on the linearly polarized all-metal Vivaldi design,the sheet-like radiating structure is replaced by a body-shaped rotationally symmetric metal with an exponential profile,and the original single-polarized feed is orthogonally processed using two vertical strip couplings.The line feeds respectively excite the radiation structures in two directions,and design the W-band broadband dual-polarized antenna.The radiation structure of the antenna is simple,and the radiation structure can be replaced to obtain different performance requirements while keeping the feed network unchanged,and the influence of the antenna height on the performance is analyzed.The simulation results show that the antenna has good impedance matching,good isolation,low cross polarization,and good pattern consistency with frequency. |
PDF Full Text Request